#include <stdio.h>

// 定义常量
int main()
{
  const int LENGTH = 10;
  const int WIDTH = 5;
  const char NEWLINE = '\n';
  int area;
  area = LENGTH * WIDTH;
  printf("area的值是：%d", area);
  printf("换行内容：%c", NEWLINE);

  return 0;
}